modeller/_version_check.py

def check_version(myversion):
  def _check_one(name, expected, found):
    if expected != found:
      message = "Expected version " + expected + " but got " + found + " when loading module " + name + ". Please make sure IMP is properly built and installed and that matching python and C++ libraries are used."
      raise RuntimeError(message)
  version = '2.2.1'
  _check_one('2.2.1', version, myversion)